It's true that there is no off the shelf tool that you can use right now to write your app, but it certainly doesn't prove that making such a tool is impossible or even complicated.
It makes sense for a complex productivity app (e.g. an office suite editor) to implement the UI from scratch anyway, and for that they may choose D. If Jane Street didn't pick OCaml, it would've died long ago -- in the same manner, some company might pick D to do UI or anything else really.
It makes sense for a complex productivity app (e.g. an office suite editor) to implement the UI from scratch anyway, and for that they may choose D. If Jane Street didn't pick OCaml, it would've died long ago -- in the same manner, some company might pick D to do UI or anything else really.